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Product Warranty Obligations
 6 Months Ended
Mar. 31, 2013
Product Warranties Disclosures [Abstract]  
Product Warranty Obligations
Product Warranty Obligations
We record a liability for product warranty obligations at the time of sale to a customer based upon historical warranty experience. Most of our products are covered under a warranty period that runs for twelve months from either the date of sale or installation. We also record a liability for specific warranty matters when they become probable and reasonably estimable. Our product warranty obligations are included in other current liabilities in the Condensed Consolidated Balance Sheet.
Changes in the product warranty obligations for the six months ended March 31, 2013 and 2012 are (in millions):
 
Six Months Ended
March 31,
 
2013
 
2012
Balance at beginning of period
$
37.8

 
$
38.5

Accruals for warranties issued during the current period
15.6

 
17.9

Adjustments to pre-existing warranties
0.1

 
2.0

Settlements of warranty claims
(17.1
)
 
(15.7
)
Balance at end of period
$
36.4

 
$
42.7